While several sites have penciled guys in, in the first round or two, beyond that it is just guesswork. i'll give you an example. I liked Paxton Lynch QB, when i saw him starring in an improbable win over a team supposed to be much better (was it Missouri, perhaps). Before that game he was a late pick, 6th or 7th round. after that win he climbed right up the draft so that at one point he was a top five overall pick. He slipped from that high spot as people watched more tape of him, but he still went at pick 26 in round one.
That uncertainty holds true for many of the later prospects, they can move up and down a lot, like between 6th round to 2nd round, depending on what they do the rest of the college season. Many guys, particularly those that are not early picks often shine in their final year, even in the last half of their final year (see the draft where we took Clay Matthews, for example), so early guesses are usually wild ones. Finally, all the collected wisdom that comes from scouts talking to each other and to media guys, and draftniks........it's only when you get to say, early March, when what consensus there is on draft boards, approaches a final form.
Most of us have no chance of watching the hundreds and hundreds of hours of tape to grade players, even if we had the talent to do so. So, the reliance on what the media is saying and thinking has a big impact on most of us. Just look at how the positional ratings on Drafttek bounce up and down over time. It'll become clearer later, but for now determining the later part of the draft is the blind leading the unsighted....................
For the four day one and two picks of the 2019 draft, it would be nice to see an Edge rusher, a Safety and an OT, taken, which leaves one more pick for something else - another rusher perhaps, or a TE. I'd probably take a second O lineman later in the draft, and fill in wherever the talent is, to bolster depth. Another coverage type ILB would be nice (especially as Josh Jones hasn't worked out so far).